Radon in Hawaii
We don't have lab test results for Hawaii yet. EPA zones for every county are below.
The EPA puts 0 of Hawaii's 5 counties in Zone 1, its highest radon category, 0 in Zone 2 and 5 in Zone 3.
Every county in Hawaii
Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.
| County | Homes tested | At or above 4 | Median | EPA zone |
|---|---|---|---|---|
| Hawaii County | No data | – | – | 3 |
| Honolulu County | No data | – | – | 3 |
| Kalawao County | No data | – | – | 3 |
| Kauai County | No data | – | – | 3 |
| Maui County | No data | – | – | 3 |
"–" means fewer than 20 tests or no lab data, too few for a reliable figure.
Sources
- EPA Map of Radon Zones (public domain).
Last updated October 2026. How we calculate these numbers.